Question

我想在模态被解除后在视图控制器上调用一个函数。我花了好几个小时试图让它工作，我发现的所有响应都没有奏效。我遵循了其他人的指示并设置了协议，但这仍然无效。

MainController：

class ViewController: UIViewController, UIPopoverPresentationControllerDelegate, loadStoreDelegate{

然后触发我使用的模态

func displaySelectStorePopup(){
        if let viewController = self.storyboard?.instantiateViewControllerWithIdentifier("SelectStoreView"){
            let selectStoreController = viewController
            selectStoreController.modalPresentationStyle = .Popover
            if let sctrl = selectStoreController.popoverPresentationController{
                sctrl.delegate = self
                sctrl.sourceView = self.view
                sctrl.sourceRect = CGRectMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds),0,0)

                sctrl.permittedArrowDirections = UIPopoverArrowDirection()
                delay(0.1){
                    sctrl.passthroughViews = nil
                }

                selectStoreController.modalInPopover = true

                selectStoreController.preferredContentSize = CGSizeMake(400, 400)

                self.presentViewController(selectStoreController, animated: true, completion: nil)
            }
        }
    }

然后函数id喜欢使用

func loadStore() {
        print(2)
        //let vc : AnyObject! = self.storyboard!.instantiateViewControllerWithIdentifier("DashboardView")
        //self.showViewController(vc as! UIViewController, sender: vc)
    }

ModalViewController：协议

protocol loadStoreDelegate{
    func loadStore()
}

class SelectStoreViewController: UIViewController, UITableViewDataSource, UITableViewDelegate{...

var delegate: loadStoreDelegate?

然后在tableview上调用该函数单击

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath){
        self.delegate?.loadStore()
        if(tableView == selectStoreTable){
            currentStore = userStores[indexPath.row]
            self.dismissViewControllerAnimated(false, completion: nil)
        }
    }

Answer 1

您的SelectStoreViewController类具有delegate实例属性。但是你永远不会将这个属性设置为任何东西。当你nil时，它是self.delegate?.loadStore()。所以自然没有任何事情发生。

我想你想要这样的东西：

func displaySelectStorePopup(){
    if let viewController = self.storyboard?.instantiateViewControllerWithIdentifier("SelectStoreView") as? SelectStoreViewController {
        let selectStoreController = viewController
        selectStoreController.delegate = self // *
        // ... and so on ...

Answer 2

经过大量阅读后，似乎使用popover是阻止我的代表所需的结果。我最后通过为工作站创建一个类来解决这个问题，该工作站包含对当前视图的引用，然后是一个运行我需要的操作的函数。

类别：

class Workstation{
    var currentView: UIViewController? = nil
    var currentStore : Store? = nil

    func loadInStore(store: Store){
        currentStore = store
        if let view = currentView{
            let vc : AnyObject! = view.storyboard!.instantiateViewControllerWithIdentifier("DashboardView")
            view.showViewController(vc as! UIViewController, sender: vc)
        }
    }

    class var workstationInstance: Workstation{
        struct Static {
            static let instance = Workstation()
        }
        return Static.instance
    }
}

SecondController：

override func viewDidDisappear(animated: Bool) {
        if let store = selectedStore{
            Workstation.workstationInstance.loadInStore(store)
        }
    }

在我的主控制器中，我只是在弹出窗口加载并设置当前视图

override func viewDidAppear(animated: Bool) {
     Workstation.workstationInstance.currentView = self
}

func displaySelectStorePopup(){
        if let viewController = self.storyboard?.instantiateViewControllerWithIdentifier("SelectStoreView"){
            let selectStoreController = viewController
            selectStoreController.modalPresentationStyle = .Popover
            if let sctrl = selectStoreController.popoverPresentationController{
                sctrl.sourceView = self.view
                sctrl.sourceRect = CGRectMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds),0,0)

                sctrl.permittedArrowDirections = UIPopoverArrowDirection()
                delay(0.1){
                    sctrl.passthroughViews = nil
                }

                selectStoreController.modalInPopover = true

                selectStoreController.preferredContentSize = CGSizeMake(400, 400)

                self.presentViewController(selectStoreController, animated: true, completion: nil)
            }
        }
    }

在Swift中解除模态后运行函数

2 个答案: